CVE-2021-31826
Shibboleth Service Provider 3.x before 3.2.2 is prone to a NULL pointer dereference flaw...
Shibboleth Service Provider 3.x before 3.2.2 is prone to a NULL pointer dereference flaw involving the session recovery feature. The flaw is exploitable (for a daemon crash) on systems not using this feature if a crafted cookie is supplied.
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- Low
- Privileges needed
- None
- User interaction
- None
What an attacker can affect
- Confidentiality
- None
- Integrity
- None
- Availability
- High
Exploit likelihood
What each source reports
NVD Score used
Shibboleth Service Provider 3.x before 3.2.2 is prone to a NULL pointer dereference flaw involving the session recovery feature. The flaw is exploitable (for a daemon crash) on systems not using this feature if a crafted cookie is supplied.
- Record
CVE-2021-31826- CVSS 3.1
- 7.5 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H - CVSS 2.0
- 5.0 Medium
AV:N/AC:L/Au:N/C:N/I:N/A:P - Weakness
- CWE-476
- Updated
- 2026-11-02
CVE List No score
Shibboleth Service Provider 3.x before 3.2.2 is prone to a NULL pointer dereference flaw involving the session recovery feature. The flaw is exploitable (for a daemon crash) on systems not using this feature if a crafted cookie is supplied.
- Record
CVE-2021-31826- Updated
- 2026-11-02
EUVDEUVD-2021-18701 No score
Shibboleth Service Provider 3.x before 3.2.2 is prone to a NULL pointer dereference flaw involving the session recovery feature. The flaw is exploitable (for a daemon crash) on systems not using this feature if a crafted cookie is supplied.
- Record
EUVD-2021-18701- Updated
- 2026-11-03
GitHub AdvisoriesGHSA-rqpx-m7mv-mxxf No score
Shibboleth Service Provider 3.x before 3.2.2 is prone to a NULL pointer dereference flaw...
Shibboleth Service Provider 3.x before 3.2.2 is prone to a NULL pointer dereference flaw involving the session recovery feature. The flaw is exploitable (for a daemon crash) on systems not using this feature if a crafted cookie is supplied.
- Record
GHSA-rqpx-m7mv-mxxf- Weakness
- CWE-476
- Updated
- 2026-11-02
OSV
Shibboleth Service Provider 3.x before 3.2.2 is prone to a NULL pointer dereference flaw involving the session recovery feature. The flaw is exploitable (for a daemon crash) on systems not using this feature if a crafted cookie is supplied.
- Record
CVE-2021-31826- CVSS 3.1
- 7.5 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H - Updated
- 2026-11-02
OSVDEBIAN-CVE-2021-31826
Shibboleth Service Provider 3.x before 3.2.2 is prone to a NULL pointer dereference flaw involving the session recovery feature. The flaw is exploitable (for a daemon crash) on systems not using this feature if a crafted cookie is supplied.
- Record
DEBIAN-CVE-2021-31826- CVSS 3.1
- 7.5 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H - Updated
- 2026-11-02
OSVUBUNTU-CVE-2021-31826
Shibboleth Service Provider 3.x before 3.2.2 is prone to a NULL pointer dereference flaw involving the session recovery feature. The flaw is exploitable (for a daemon crash) on systems not using this feature if a crafted cookie is supplied.
- Record
UBUNTU-CVE-2021-31826- CVSS 3.1
- 7.5 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H - Updated
- 2026-11-02
Affected products
Affected packages
| Package | Affected | Fixed |
|---|---|---|
shibboleth-spDebian:12 |
before 3.2.2+dfsg1-1 | 3.2.2+dfsg1-1 |
shibboleth-spDebian:13 |
before 3.2.2+dfsg1-1 | 3.2.2+dfsg1-1 |
shibboleth-spDebian:14 |
before 3.2.2+dfsg1-1 | 3.2.2+dfsg1-1 |
shibboleth-spDebian:10 |
before 3.0.4+dfsg1-1+deb10u2, plus listed versions 3.0.4+dfsg1-13.0.4+dfsg1-1+deb10u1 |
3.0.4+dfsg1-1+deb10u2 |
shibboleth-spUbuntu:20.04:LTS |
before 3.0.4+dfsg1-1ubuntu0.2, plus listed versions 3.0.4+dfsg1-13.0.4+dfsg1-1build13.0.4+dfsg1-1ubuntu0.1 |
3.0.4+dfsg1-1ubuntu0.2 |
History
| Recorded | Changed | Sources |
|---|---|---|
| aliases | EUVD | |
| first indexed | CVE List, GitHub Advisories, NVD, OSV |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2021-31826 is a high vulnerability (CVSS 7.5) in Shibboleth Service Provider, published April 27, 2021. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 2.00%, the 80th percentile. Fixed in shibboleth-sp 3.2.2+dfsg1-1.